In a large mixing bowl, whisk together the Dijon mustard, whole grain mustard, honey, apple cider vinegar, and olive oil until smooth.
Season the dressing with salt and pepper to taste.
Notes
Store this dressing in an airtight container in the refrigerator, such as a small Mason jar or glass storage container. It will stay fresh for about 5-7 days.
Shake again before using. If you make this dressing in advance, be sure to mix or shake it well again before using as the ingredients can settle and separate.